package com.beijing.reflection;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @Author Ma Wenqi
 * @Date 2021/3/29 16:29
 * @Version 1.0
 */
public class Demo09 {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test1();//5ms
        test2();//4114ms
        test3();//1483ms
    }

    //普通方式
    public static void test1(){
        User user = new User();
        long start = System.currentTimeMillis();
        for (int i = 0; i < 1000000000; i++) {
            user.getName();
        }
        long end = System.currentTimeMillis();
        System.out.println("普通方式："+(end-start)+"ms");
    }

    //反射方式调用 关闭检测
    public static void test2() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName",null);

        long start = System.currentTimeMillis();
        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user,null);
        }
        long end = System.currentTimeMillis();
        System.out.println("反射检测执行10亿次！"+(end-start)+"ms");
    }

    //反射方式调用
    public static void test3() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName",null);
        getName.setAccessible(true);
        long start = System.currentTimeMillis();
        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user,null);
        }
        long end = System.currentTimeMillis();
        System.out.println("关闭反射检测执行10亿次！"+(end-start)+"ms");
    }
}